For the Weyl quantization [1]}, [2]}, the general rules are the same of above and, for the monomials, we have instead
\(x_i^rp_i^s\rightarrow \frac{1}{2^s}\sum _{k=0}^s \binom{s}{k} \hat{p}_i^{s-k}\hat{x}_i^r\hat{p}_i^k.\) 
